I think it's a tough question... and sometimes even your own
heart wouldn't know.
Sometimes u get to know a girl/guy. Find her/him not bad, went
steady for few years and decided to settle down. At that point, you
feel that if not her who else? You're blinded at that point, you
see what u want to see, what you think you're seeing. Few years
later, relationship turn colder and become more of a responsibility
rather than love, some even end up in divorce..... is she/he the
one then?
Unless you see movie and such got such dramatic events close one
eye also know your other half is here. In real life, i doubt
so...
No one can tell you... not even you can tell. And even if someone
tell you he/she is not, does it change anything to you? If so...
just follow your heart and just dun regret the decision you've
made.